Valve Guide / Oil Scraper Ring
Inspection / Replacement
A5.05. 01.05.01.01
15000
M20
en / 31.05.2010 IB021186 2/2
01
2. Measurement of the valve guide clearance.
2.1 Measure the outside diameter of the valve stem in the zone of the guide bush.
2.2 Measure the inside diameter of the guide bush in traverse direction of the engine.
2.3
Normal clearance (mm) Limit clearance (mm)
Exhaust
Inlet 0.10 - 0.17 0.4
3. Replacement of the valve guide
NOTE
If possible replace the valve guide in the workshop of a MaK dealer during the over-
haul of cylinder head. There is a risk that the cylinder cover may be damaged when
the old valve guide is knocked out.
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